What is the CVSS score of CVE-2026-1420?

CVE-2026-1420 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-1420?

Yes, a public proof-of-concept exploit is available for CVE-2026-1420. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-1420?

Within 24 hours: Identify and inventory all Tenda AC23 devices running firmware 16.03.07.52 across the organization; restrict administrative access to affected devices to trusted networks only. Within 7 days: Implement network segmentation to isolate affected routers from critical systems; enable enhanced monitoring and logging on these devices; evaluate replacement equipment from alternative vendors. Within 30 days: Complete migration away from vulnerable Tenda AC23 units or apply any available security updates from Tenda if released; conduct network assessment for signs of prior exploitation.

Ac23 Firmware CVE-2026-1420

HIGH

Buffer Overflow (CWE-119)

2026-01-26 cna@vuldb.com

Buffer Overflow Tenda Ac23 Firmware

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate to Tenda AC23 web interface
Delivery

Send crafted POST request to /goform/WifiExtraSet
Exploit

Inject oversized wpapsk_crypto parameter
Execution

Overflow buffer memory
Impact

Execute arbitrary code as root

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Tenda AC23 running firmware 16.03.07.52 with /goform/WifiExtraSet endpoint accessible. Attacker requires valid login credentials to access the vulnerable WifiExtraSet function.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Unauthenticated attackers can trigger a buffer overflow in Tenda AC23 firmware version 16.03.07.52 through the wpapsk_crypto parameter in /goform/WifiExtraSet, enabling remote code execution with full system compromise. Public exploit code is available and actively used in the wild, yet no patch has been released by the vendor. All AC23 devices running the affected firmware version are at immediate risk of complete takeover.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:00 CVSS 8.8

A flaw has been found in Tenda AC23 16.03.07.52. This impacts an unknown function of the file /goform/WifiExtraSet. [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-119 (Buffer Overflow). Affects Ac23 Firmware. A flaw has been found in Tenda AC23 16.03.07.52. This impacts an unknown function of the file /goform/WifiExtraSet. This manipulation of the argument wpapsk_crypto causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Jan 28, 2026 - 14:44 vuln.today

Public exploit code

CVE Published

Jan 26, 2026 - 06:16 nvd

HIGH 8.8

DescriptionCVE.org

A flaw has been found in Tenda AC23 16.03.07.52. This impacts an unknown function of the file /goform/WifiExtraSet. This manipulation of the argument wpapsk_crypto causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

Executive ViewAI

Why It Matters

A high-severity vulnerability (CVE-2026-1420) affecting Tenda AC23 wireless routers has been publicly disclosed with working exploits available, but no patch currently exists. Organizations using this equipment face immediate risk of unauthorized access and potential network compromise, requiring urgent mitigation actions to prevent exploitation.

Business Impact: High

Compensating Controls

Disable the /goform/WifiExtraSet function if configuration interface allows; restrict network access to the management interface via firewall rules and VPN requirements; segment affected devices from critical infrastructure; implement WAF rules to block suspicious requests to the vulnerable endpoint; disable remote management access and require only local administration; monitor for unauthorized configuration changes; consider temporary shutdown of non-essential Tenda AC23 devices pending patch availability or replacement.

Threat Intelligence Overview

EPSS Score

0.0%

Top 91% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.